Removing the expansion module cover
Important: Electrostatic discharge can damage expansion module components. Use proper
electrostatic discharge precautions during installation, setup, and servicing to avoid damaging
the expansion module.
Important: Disconnect all power sources to the expansion module before removing cover and
changing the position of any jumper or the EOL switch on the expansion module. Failure to
disconnect power before changing a jumper or EOL switch position can result in damage to
the expansion module and void any warranties.
The expansion module cover is held in place by four plastic latches that extend from the base and
snap into slots on the inside of the housing cover.
To remove the expansion module cover, complete the following steps:
1. Place your fingernails under the two cover lift tabs (Figure 3) on the sides of the housing cover
and gently pry the top of the cover away from the base to release the cover from the two
upper latches.
2. Pivot the top of the cover further to release it from the lower two latches.
3. Replace the cover by placing it squarely over the base, and then gently and evenly push the
cover on to the latches until they snap into the latched position.
Figure 10: Controller with cover removed
Setting the End-of-Line (EOL) switch
Each expansion module has an EOL switch. When the EOL switch is set to ON, it sets the expansion
module as a terminating device on the bus. See Figure 11 for the EOL switch location. The default
EOL switch position is OFF.
Figure 11: End-of-Line switch positions
To set the EOL switch on an expansion module, complete the following steps:
21FX-PCX2721 Expansion Input/Output Module Installation Instructions
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